I found them to be very good. Love the fact that they can fit probably every size of book since it contains many options for the binder (book) rings.
The package also contains the pots to add them to the book. No need to order extra posts.

Great product! This is the best CD & Index Print storage binder I've found - and I have been using it for years for all my photo CDs and Index Prints (I have bought about 20 of them). These are the refills for the binders - I add two refill sets to each binder. It makes it easy to keep all your photos stored somewhere besides your hard drive! And GetSmart Products has great customer service, fair prices, and good delivery.